Equivalent of C# lock in Java?

Question

Equivalent of C# lock in Java?

For example:

public int Next() {
  lock (this) {
    return NextUnsynchronized();
  }
}

How do I port this C# method to Java?

Answer 1

public int Next() {
    synchronized (this) {
        return NextUnsynchronized();
    }
}

That's it. And the next code is better.

public synchronized int Next() {
    return NextUnsynchronized();
}

Answer 2

java.util.concurrent.locks.Lock    
lock.lock();

    int newCount = ++count;
    lock.unlock();